Electrolysis And Storage Of Batteries MCQ

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• Undercharging
  ক

  Reduces specific gravity of the electrolyte

  খ

  Increases specific gravity of the electrolyte

  গ

  Produces excessive gassing

  ঘ

  Increases the temperature
• When a lead-acid battery is in fully charged condition, the color of its positive plate is
  ক

  dark grey

  খ

  brown

  গ

  dark brown

  ঘ

  none of above
• In a lead-acid battery the energy is stored in the form of
  ক

  charged ions

  খ

  chemical energy

  গ

  electrostatic energy

  ঘ

  electromagnetic energy
• Which of the following primary cells has the lowest voltage ?
  ক

  Lithium

  খ

  Zinc-chloride

  গ

  Mercury

  ঘ

  Carbon-zinc
• Capacity of a battery.is expressed in
  ক

  Ah

  খ

  Vh

  গ

  Wh

  ঘ

  kWh
• A dead storage battery can be revived by
  ক

  Adding distilled water

  খ

  Adding so-called battery restorer

  গ

  A dose of H₂SO₄

  ঘ

  None of the above
• The storage battery generally used in electric power station is
  ক

  nickel-cadmium battery

  খ

  zinc-carbon battery

  গ

  lead-acid battery

  ঘ

  none of the above
• Internal short circuits are caused by
  ক

  breakdown of one or more separators

  খ

  excess accumulation of sediment at the bottom of the cell

  গ

  both (A) and (B)

  ঘ

  none of the above
• In a lead-acid cell dilute sulfuric acid (electrolyte) approximately comprises the following
  ক

  One part H₂O, three parts H₂SO₄

  খ

  Two parts H₂O, two parts H₂SO₄

  গ

  Three parts H₂O, one part H₂SO₄

  ঘ

  All H₂SO₄
• During discharge, the active material of both the positive and negative plates is changed to
  ক

  Pb

  খ

  PbO₂

  গ

  PbO

  ঘ

  PbSO₄
• Over charging
  ক

  produces excessive gassing

  খ

  loosens the active material

  গ

  increases the temperature resulting in buckling of plates

  ঘ

  all above
• Ampere hour capacity of an industrial battery is based on ____ hours discharge rate.
  ক

  8

  খ

  12

  গ

  16

  ঘ

  24
• When two batteries are connected in parallel, it should be ensured that
  ক

  they have same e.m.f.

  খ

  they have same make

  গ

  they have same ampere-hour capacity

  ঘ

  they have identical internal resistance
• Battery container should be acid resistance, therefore it is made up of
  ক

  glass

  খ

  plastic

  গ

  wood

  ঘ

  all above
• The specific gravity of electrolyte is measured by
  ক

  manometer

  খ

  a mechanical gauge

  গ

  hydrometer

  ঘ

  psychrometer
• A constant-voltage generator has
  ক

  minimum efficiency

  খ

  minimum current capacity

  গ

  low internal resistance

  ঘ

  high internal resistance
• If a battery is wrongly connected on charge following will happen
  ক

  current delivered by the battery will be high

  খ

  current drawing will be nil

  গ

  current drawing will be very small

  ঘ

  current drawing will be very high
• When the load resistance equals the generator resistance which of the following will be maximum ?
  ক

  Current

  খ

  Efficiency of the circuit

  গ

  Power in the load resistance

  ঘ

  Voltage across the load resistance
• Under normal charging rate, the charging current should be
  ক

  10% of capacity

  খ

  20% of capacity

  গ

  30% of capacity

  ঘ

  40% of capacity
• Cells are connected in series in order to
  ক

  increase the voltage rating

  খ

  increase the current rating

  গ

  increase the life of the cells

  ঘ

  none of the above
• Those substances of the cell which take active part in chemical combination and hence produce electricity during charging or discharging are known as______materials.
  ক

  passive

  খ

  active

  গ

  redundant

  ঘ

  inert
• The charge required to liberate one gram equivalent of any substance is known as ______ constant
  ক

  Time

  খ

  Faraday’s

  গ

  Boltzman

  ঘ

  none of the above
• In ______ system the charging current is intermittently controlled at either a maximum or minimum value
  ক

  two rate charge control

  খ

  trickle charge

  গ

  floating charge

  ঘ

  an equalizing charge
• When the lead-acid cell is fully charged, the electrolyte assumes _____ appearance
  ক

  dull

  খ

  reddish

  গ

  bright

  ঘ

  milky
• In constant-current charging method, the supply voltage from discharged to fully charged condition
  ক

  decreases

  খ

  increases

  গ

  remains constant

  ঘ

  none of the above
• In constant voltage charging method, the charging current from discharged to fully charged condition
  ক

  decreases

  খ

  increases

  গ

  remains constant

  ঘ

  none of the above
• Sulphated cells are indicated by
  ক

  the loss of capacity of the cell

  খ

  the decrease of the specific gravity

  গ

  the low voltage of the cell on discharge

  ঘ

  all above conditions
• The substances which combine together to store electrical energy during the charge are called ______ materials
  ক

  active

  খ

  passive

  গ

  inert

  ঘ

  dielectric
• The common impurity in the electrolyte of lead-acid battery is
  ক

  chlorine

  খ

  dust particles

  গ

  lead crystals

  ঘ

  iron
• In a lead-acid cell, lead is called as
  ক

  positive active material

  খ

  negative active material

  গ

  passive material

  ঘ

  none of the above